DECtape Transport TU55

This document serves as the official instruction manual for the Type TU55 DECtape Transport, a solid-state, bidirectional, magnetic-tape device manufactured by Digital Equipment Corporation. It provides detailed technical information for maintenance personnel, including functional descriptions, theory of operation for logic circuits and motor controls, and interface specifications. The manual also includes preventive maintenance schedules, troubleshooting procedures, and a complete set of engineering drawings to facilitate the installation, operation, and repair of the device within larger DEC computer systems.